This got me to thinking about the 32K memory expansion board I talked my parents into getting me for my TI-99/4A‘s Peripheral Expansion Box [more info at MainByte here]. I got it in 1983 and I recall it cost $299. For 32K. (Kilobytes, not megabytes.) My current main computer, a Power Mac dual G5 2.5GHz, has 2.5GB of RAM. That’s 80,000 times more memory than the memory expansion board I had for my TI. That 2.5 GB cost me maybe $400. I did the math and discovered that if the G5’s 2.5GB of RAM were purchased in 1983, the cost would have been $23,920,000.

Talk about tecehnology becoming more affordable….

UPDATE 11/13/2008: My Mac Pro and MacBook both have 4GB of memory. That much memory would’ve gone for $39,191,000 in 1984.

UPDATE 4/23/2009: I just ordered and additional 4GB of RAM for my Mac Pro, which will take it to 8GB total. Back in 1984, that much memory would have cost $78,382,000. Adjusted for inflation, that’s $162,668,000 in 2009 dollars.

UPDATE 4/27/2009: Ok, due to some bank access issues with FB-DIMMs, in order to run optimally, I had to grab a second 4GB upgrade, taking me to 12GB total in the machine with all 4 banks (all 8 slots) filled. In 1984 this would have cost $117,573,000. Adjusted for inflation, that’s $244,002,000.

UPDATE 1/16/2013: The memory in my main workstation climbs on! A year ago, I replaced my rev 1 Mac Pro with a “mid-2011” iMac, which I configured with 16GB of RAM (not to mention 2GB of RAM hanging off the GPU). In 1984, 16GB of RAM would have cost $156,764,000. Adjusted for inflation, that’s $346,410,720.

UPDATE 6/6/2017: I’ve made some space on the desk next to the aforementioned iMac (which is still going strong) for a high-end gaming PC that I built to play No Man’s Sky. It’s a Windows 10 machine with a 4GHz Core i7-6700K and an Nvidia GTX 1080 graphics board. The system has 16GB of DDR4 3200 RAM and the video card has 8GB of GDDR5X RAM onboard. The 24GB of total RAM in this system is 786,432 times as much memory as I added to that TI way back when and, if purchased in 1983, would have cost $235,143,168. Adjusted for inflation, that’s $585,422,403 in today’s money. And, the slower of these two RAM types — the DDR4 3200 — peaks at 25,600MB/second, so it’s a bit faster than that 32K of TI expansion RAM, as well.

10 Responses to Quite a Memory

I’ve got a memory module (core memory) for an ancient cdc 3170 mainframe that has 16K 24-bit words (48KB) that had a replacement cost back in 1976 or so of about $10K. I GBs worth of this kind of memory (not taking inflation into account–or facilities and air conditioning) would be around $208M! It’s maybe 8″x8″x18″ and weighs (I’m guessing) 30-40 pounds. Makes a cool paperweight! :-)

I was thinking of this the other day. I saw a 120GB HD on sale for $20 after rebate. In the early 90s I bought an external HD for my wife’s computer – 512MB for about $500. At that rate ($1/MB) that 120GB drive would have cost $120,000.

I’m 30, and the first computer I owned was a Timex Sinclair 1000 (aka ZX81). It was the cheapest computer around when I got it in 1983, but it had 2k of RAM!! Think about it, that’s 2048 characters/bytes! And let’s not forget that it’s Z80 CPU was running at like 0.2MHZ!

There was a bulky 16k RAM extension available, at a price higher than the computer itself! (Something like 150-200$).

My current Mac has like 20,000 times more RAM than this :)

I still have a couple of old computer magazines from the era, and these are really fun to read these days, if only for the prices :-)

I’m only a young guy, but I’ve been building my computers for about 6 years now since I was 11. I allways decided upon what was worth upgrading and what was just enuconomical by thinking about where computer’s would be in a few years. I remember four years ago, I calculated what 2 GB of good quality ram would cost, and it came arround to $2Gs. 500 GBs of HD space could cost over 1G, and and a multiple processor machine would mean a really expensive motherboard and 1G worth of CPUs. Now days you can get that ram fora few hundred, as well as the hard drive space, and as for multiple processors, you can get dual-core or hyper-threading at the average cost of a CPU

In 1972, my department at Stanford bought an HP 9830 desktop computer. It came with 2K of RAM. We decided to increase the RAM amount to 6K to allow us to run bigger programs. That extra 4K of RAM cost $4,000; i.e., $1/Byte. Therefore 1GB of RAM back then would have cost $1 Billion.